I used a recipe from the genius David Lebovitz to make these decadent brownies. Unlike many other recipes for brownies, these were fairly light, and extremely tasty. See the recipe here - http://www.davidlebovitz.com/archives/2006/06/dulce_de_leche.html
And see the results here, served with home made vanilla ice cream, of course!
And here just out of the oven -
These were amazing straight out of the oven, when I cut into them and the melted dulce de leche started oozing out!